Update coverage to 4.5.3

[pyup-bot]

This PR updates coverage from 4.5.1 to 4.5.3.

The bot wasn't able to find a changelog for this release. Got an idea?

Links

• PyPI: https://pypi.org/project/coverage
• Changelog: https://pyup.io/changelogs/coverage/
• Repo: https://github.com/nedbat/coveragepy

[codecov-io]

Codecov Report

Merging #94 into master will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##           master   #94   +/-   ##
====================================
  Coverage      30%   30%           
====================================
  Files           3     3           
  Lines          10    10           
====================================
  Hits            3     3           
  Misses          7     7

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[pyup-bot]

Closing this in favor of #120